FORSAH

Ventilation Validation

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Ventilation Validation

Ireland's 2019 building regulations (Part F) mandate third-party validation and certification for all new ventilation systems.

Forsah, with extensive experience in designing and commissioning various ventilation systems (mechanical extract, demand-controlled, heat recovery, exhaust air heat pumps), is NSAI certified and offers efficient ventilation validation services for residential developers to meet Part F requirements.

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Benefits of Ventilation Validation

With new build houses now requiring a high level of air tightness it is crucial that the ventilation system installed is supplying enough fresh air to make a living space both healthy and comfortable.

Having the system independently validated ensures that excess CO2, odours and Volatile Organic Compounds are removed from a dwelling removing and potential health hazards from a lack of ventilation.

Further benefits to the validation of the system include ensuring that you do not have any over ventilation which contributed to running costs of your heating system and correct extract rates will remove any excess moisture inside the dwelling.

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Types of ventilation system

There are 3 main types of ventilation systems as detailed in part F of the building regulations and outlined below.

Continuous Mechanical Extract Ventilation (cMEV)

cMEV as the name suggests provides a continuous extract rate from all wet rooms within a dwelling. The system needs to be designed & commissioned to ensure the extract rates achieve the rates detailed in Table 1 of the TGD part F. The passive air entering the house is supplied via background ventilators which need to be installed in the habitable rooms.

Mechanical Ventilation with Heat recovery (MVHR)

A MVHR system combines the extract method used in cMEV but instead of the extract air being extracted straight to outside it is diverted through a heat exchanger where it is used to pre heat the passive air entering the house. MVHR is the most efficient form of ventilation available for a dwelling.

Natural Ventilation

With a natural ventilation system there is no continuous extract in the dwelling. Intermittent extract fans are installed in the wet rooms to extract excess moisture and background ventilators are installed throughout the house to the specification detailed in Table 3 of TGD part F. Natural ventilation can only be used where the air tightness is greater than 3m3/hr/m2.